Furnace-pipe



{No Model.)

B. A. EVERSMAN 85 D. WAGNER.

FURNAOE PIPE. No. 411652. Patented Sept. 24. 1889.

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UNITED STATES PATENT FFIGE.

ERNST A. EVERSMAN AND DANIEL XVAGNER, OF TOLEDO, OHIO.

FURNACE-PIPE.

SPECIFICATION forming part of Letters Patent No. 411,652, dated September 24, 1889.

Application filed April 29, 18539.

To all whom it may concern.-

Be it known that we, ERNST A. EVERSMAN and DANIEL TAGNER, citizens of the United States, residing at Toledo, in the county of Lucas, State of Ohio, have invented certain new and useful Improvements in Furnace- Pipes, of which the following is a specification, reference being had therein to the accompanying drawings.

The object of our invention is the provision of a device whereby the warm air from a furnace acts as a ventilator, bringing cold air from the cellar or outside, which cold air is partly warmed on its way up, and at the same time to prevent the coal-dust and ashes from rising up through the ventilator into the rooms above.

The invention also involves an air-space between the ordinary hot-air flue or shaft and the adjacent wood-work and lathing of a building, thereby contributing to safety against fire.

To this end we have constructed our device as described in the following specification, and with the novel features particularly set forth in the claims at the end of the same.

In the drawings, Figure 1 is a side elevation of a warm-air shaft, showing our closing device. Fig. 2 is a longitudinal section of the same, showing the double construction of our shaft. Fig. 3 is a side elevation of our shaft, showing the closing apparatus in the closed position for the exclusion of the cold air of the cellar. Fig. i is a detail in vertical longitudinal section of a length or section of our shaft, showing .the method of constructing the same without solder or rivets. Fig. 5 is avertical section and plan of end portions of adjacent sections. Fi 6 is a perspective detail showing the rib and its receiving-slot, one of the parts shown as being reversed to better illustrate the construction.

A is a warm-air shaft, made in sections A,

consisting of an inner passage surrounded by a ventilatingpassage, as shown at A and A in Fig. 2. B is the hot-air register, into which the outer passage communicates at the front, and also from the back by the passage B.

C is the opening for connection of the hot- Serial No. 809,081. (No model.)

air pipe to the furnace, through which the hot air is led into the inner passage of the air-shaft.

The enveloping or outer passage communicates with the cellar by the opening D, which opens only into said passage. Now when the hot air is admitted into the main passage A the air in the outer passage is warmed, and there is thereby induced a convective current in the latter which causes the inward draft of the outer air through the opening D. This allows of the admission of the cellar-air, or by a suitable conductor out-door air,'into the rooms of the house, the advantage of this being that said air is not desiccated, as is that which has passed through the furnace, even where water is used near the same. This produces a much more salutary atmosphere in the rooms of the house than is ordinarily found. The sections composing our air-shaft are formed in detail as shown in 4 and 5. The outer wall, of tin or other sheet metal, is made to surround in one or more pieces the whole shaft, while the inner wall is made in one or more pieces, as desired.

In Fig. 4the outer wall is shown at E and the inner at'F. It will be seen that there is a double bend, or two bends, at the top of the outer Wall of each section, as at E and E the portion between the bends E E being perforated, as at E all the way around the shaft at proper intervals and at G, for a purpose hereinafter mentioned. The inner wall is turned over the top edge of the outer, as shown at F in Fig. 4, while the lower portion of the inner wall is provided with a double bend of the same nature as that at E and E and perforated in the same manner, and has a projecting tip or end G. The lower edge of the inner wall is bent over that of the outer wall in the manner shown at F If desired, the upper and lower edges of the inner wall may be folded over the upper and lower edges of the outer wall. Both the inner and the outer walls are provided with beads and F for the abutment of the edge of the end of the next section when inserted therein. This insertion is shown in Fig. 2.

Fig. 6 is a perspective detail, and Fig. 5 is a detail in vertical section showing the manner in which the whole shaft is Strengthened and the connection of the sections solidified. Here it will be seen that one edge of the material constituting the outer wall is turned at approximately a right angle inwardly to form a rib or wing of a depth nearly as great as the width between the inner and outer walls. This wing or rib is shown at G. The tip of this rib is adapted to enter the slot G formed between the bends E and E in an adjacent length or section, and to brace two adjoining sections of the shaft, as shown at G. (See also dotted lines G G, Fig. 2.) The presence of this series of ribs, forming a continuous supporting-brace all along lengthwise of the shaft, strengthens the whole materially against crushing from lateral pressure and permits of a considerable interval between the points of lateral support of the shaft in a Wall-matters of great importance in the ease with which the whole is inserted and retained in operative position.

\Vhile the air from the cellar is in a majority of cases and at most times in such a condition as to be objectionable, still it is usually cool and aids in keeping the outer wall of the shaft cool. It is therefore preferable to connect the opening D with the outside air. There are also times-as, for instance, when the furnace is shaken or when coal is being thrown into the cellarwhen the air is so full of ashes and dust as to be very deleterious. At such times it is expedient to have some method of stopping the draft of air from the cellar until this state of things shall have ceased, and also from the outside. To this end We have provided the valve H, consisting of a piece of sheet metal pivoted to the side of the shaft at H and adapted to pass in front of the opening D for the purpose of closing the same. Fastened to any convenient point on the shaft near the pivotal pin H there is a wire or other spring H wound around said pin H and attached, as shown, to the valve in such a manner as to tend to hold the same open, as shown in Fig. 1. Attached forward of the pivotal point of the valve there is a holding or looking link H provided at the end with a loop, as shown. On the forward end of the valve there is aturned-up strip l-l acting as a stop for preventing the entire removal of the valve from the aperture. This stop in this case abuts against the collar D, surrounding the aperture, as shown; but it is evident that any well-known form of stop may be employed to accomplish this object Without departing from the spirit of the invention. A locking-pin H is pivoted to the end of the shaft for the purpose of locking the link, and thus the valve, by simply passing the loop on the end of the latter over a bent-up portion of the pin H (Shown at H This is plainly shown in dotted lines in Fig. 3. The rear end of the valve is continued backward, and there is fastened thereto a wire, the upper end of which is fastened to a bell-crank lever at the register or near thereto, as shown at I. This bell-crank is pivoted to the side of the shaft, and to the other arm of the same there is fastened a link 1 the other end of which is fastened to a slide 1 sliding in a guide fastened to the side of the shaft. Pivoted to the side of ,this slide there is placed a pull-link I, provided witha finger-knob at the front end of register, as shown,whereby the slide may be thrust in and out. The push-link I is provided, as shown, with a notch adapted to catch at the side of the register and prevent the return of the link through the instrumentality of the spring H in the cellar. It is evident on inspection that by pulling the link I the valve in the cellar will be closed, and thus the upward draft of the air will be cut off, the whole being held in this position by the action of the notch on the side of the register. WVhen it is desired to open the aperture D, the notched link is raised until the notch is disengaged from the register, and the valve allowed to return by the action of the spring H If the friction between the valve and the register be too great for overcoming this spring, the link may be pushed to aid its action. Thus the open ing may be commanded from any register in the house, and by having awire communicating with every register it may be opened or shut from all. W'hen closed at the cellar, the locking will be done by means of the looking link and pin, as above described, and as shown in Fig. 3.

What we claim is 1. A hot-air shaft composed of sections of sheet metal, said sections having inner and outer walls, having at their ends laterally-extending portions and extensions, the lateral portions being perforated to permit of communication between their respective outer passages bet-ween said walls, substantially as specified.

2. A hot-air shaft composed of sections of sheet-metal walls spaced to form an outer passage, said sections fitting into one another and at their ends bent to form oppositely'extending lateral portions and extensions, said lateral portions being perforated for communication of their respective outer passages, substantially as specified.

3. A sheet-metal section of ,-a hot-air shaft, composed of inner walls having the right-angled bends, as described, one of said bent portions being perforated, in combination with outer walls having corresponding bends extending in the opposite direction, one of which bent portions is also perforated, the edges of said walls being turned over each other at the ends, substantially as specified.

4. A sheet-metal section for a hot-air shaft, composed of an outer wall bent and perforated, as specified, in combination with an inner wall formed in two parts, the vertical edges ofsaid parts bent to form wings 0r ribs, as described, said walls separated to receive the tips of said wings or ribs, said inner wall being bent and perforated, as specitied, and having its edges turned over those of said outer Wall, substantially as specified.

5. A hot-air shaft having an inner and an outer wall constituting an inner and an outer passage, respectively, said outer passage communicating at the bottom thereof with the outer air by an aperture, and both passages having a common register, in combination with a valve for said aperture, a spring tending to open said valve, a bell-crank pivoted near said register, and means for connecting said bell-crank with said valve, substantially as specified.

6. In a hot-air shaft having an inner and an outer passage, the outer passages communicating with the outer air by an aperture, a pivoted valve playing in front of said aperture, a spring attached to the sametending to open it, a stop thereon to limit this tendency of the spring, and an abutment for the stop, in combination with a bell-erank, a slide connected therewith by a link, and means for connecting said valve with said bell-crank, substantially as specified.

7. In a hot-air shaft having an inner and an outer passage, said outer passage communicating with the outer air by an aperture, a pivoted valve playing in front of said aperture, a spring tending to open said valve,

and a stop for limiting this tendency of the spring, in combination with means for operating the valve, a link attached to said valve and having a loop, and a locking-pin pivoted near said link and having a projection over which said loop is adapted to fit, substantially as specified.

8. A section of a double-walled air-shaft, having perforated lateral bent portions at each end and provided at one end with slots for the reception of the ribs of an adjacent section and a strengthening-rib at the other, substantially as specified.

In testimony whereof We affix oursignatures in presence of two witnesses.

ERNST A. EVERSMAN. DANIEL XVAGNER. Witnesses:

E. 0.,KING, HORACE A. MERRILL. 

